I have had this computer for well over two years and it still sits there unable to be worked on or any progress of any kind.

I Have asked a local collector with the disks but his drives dont work or something so he cant copy them or anything. Still wouldnt stop him from bringing them round to try in my computer, thanks anyway.....

Can anyone help with the floppies so I can determine if my disks are bad?

What I could really do with is a binary snap-shot of system 80 memory while the DOS is in memory so I can load this image through the cassette port from my laptop, this would be a lot easier as a file can be emailed and I can format disks and get directories etc once I have DOS loaded into memory.

RonTurner wrote:What I could really do with is a binary snap-shot of system 80 memory while the DOS is in memory so I can load this image through the cassette port from my laptop, this would be a lot easier as a file can be emailed and I can format disks and get directories etc once I have DOS loaded into memory.

I can send you a disk or two Gavin. I only have single density boot disks though? PM me with your address if interested.

Tez: Being like Model I, track zero will need to be in single density. I presume RonTurner's System 80 has a doubler fitted, otherwise the entire disk has to be single density. Can your PC set up do SD ok?

Wouldn't it be easiest to copy one of your boot disks on a disked System 80 or Model 1?

I did tried and download a couple of emulators of the system80 but was stumped when the unregistered version would not allow me to make a snapshot of memory.

I want to transfer DOS via cassette loading into memory so I can access the init and directory procedures.

Can anyone email me a binary dump of a system80 with DOS loaded into memory , from an emulator to save me time proc-dumping the emulator and finding the emulators memory location within the dumped file.

Once I have DOS in memory via audio transfer I will generate a floppy from assembly calls.

Can anyone email me a binary dump of a system80 with DOS loaded into memory , from an emulator to save me time proc-dumping the emulator and finding the emulators memory location within the dumped file.

Unfortunately it isn't that simple with the TRS-80 type machines. The operating systems (except for CP/M) make extensive use of overlays so the entire OS is not in memory at one time.

You really need to get a proper boot disk I am afraid.

NewDOS/80 or LDOS would be a good choice for a System/80 with expansion interface.

I think Terry offered to send you disks or failing that approach Ian Mavric in Australia. He supports the TRS-80 community in a big way.

Alternatively you can make them fairly easily using an old PC (I use a Compaq Deskpro with a P2 processor) and David Keil's emulator (Model1.exe). This supports writing to real diskettes on the PC and if the machine supports single density (like mine) you have a Model 1 boot disk.

Wanted: S-100 Bus components - please PM me if you have any. They don't even need to work!

RonTurner wrote:What I could really do with is a binary snap-shot of system 80 memory while the DOS is in memory so I can load this image through the cassette port from my laptop, this would be a lot easier as a file can be emailed and I can format disks and get directories etc once I have DOS loaded into memory.

@RonTurner

The operating systems for the Model 1/3/4 are made up of various system modules that are loaded as per command,Sorry a dump would NOT work.

RonTurner wrote:What I could really do with is a binary snap-shot of system 80 memory while the DOS is in memory so I can load this image through the cassette port from my laptop, this would be a lot easier as a file can be emailed and I can format disks and get directories etc once I have DOS loaded into memory.

@RonTurner

The operating systems for the Model 1/3/4 are made up of various system modules that are loaded as per command,Sorry a dump would NOT work.

Ray (Over the Ditch)

I have a system80 (blue label), are you saying that no two newdos80 disks are the same since the modules are relocatable and only required routines are on the disk ???? I thought thats DOS/ CP/M ?

I thought newdos bootstraps from a loading routine that loads newdos into RAM at the same address and same routines every time ?

Dont worry about trs80 solutions I dont own a trs80?

If anyone can point me in the direction of a system80 emulator that allows snapshots that would be a great help, I can extract newdos from a snapshot then transfer it through the audio port..or at least try to lol......

System 80 (essentially TRS-80 Model 1) DOS's were written to operate in a very small amount of memory. 32k of RAM (the minimum expanded RAM) but in reality less than that as applications/games typically gobbled up at least 16k of it. Because of this, the DOS tended to load system modules off the disk as they were needed. You don't get the whole DOS in memory at any one time therefore, and simply writing a memory bump to disk won't work.

In saying that, some kind of bootstrap software which could load in a WAV dump of a disk image through the cassette port and write it track by track to a real disk would be something novel and much valued by the System 80/TRS-80 community. Similar to ADT-PRO for the Apple II line. I'm not sure if this is the kind of thing you are planning though?